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Separation and purification and degradation method for lignin

A lignin and wood powder technology, applied in the field of biomass extraction and utilization, can solve the problems of high energy consumption and increased degradation cost, achieve high conversion rate and selectivity, and reduce pollution

Active Publication Date: 2017-08-29
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, it is reported in the literature that most of the catalysts used in lignin hydrorefining are noble metal catalysts such as Pt, Ru, Au, etc., and the degradation cost is greatly increased.
Nickel-based catalysts are cheap hydrocracking catalysts, but the reaction temperature is usually above 350°C and the energy consumption is high. Therefore, it is necessary to design a new catalytic system to reduce the energy consumption of the reaction.

Method used

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  • Separation and purification and degradation method for lignin
  • Separation and purification and degradation method for lignin
  • Separation and purification and degradation method for lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of enzymatic residue lignin

[0042] (1) Raw material pretreatment stage: crush the eucalyptus wood raw material to ultra-fine particle size (>200 mesh).

[0043] (2) Enzymatic hydrolysis stage: ball-milled wood powder is added to sodium acetate buffer at a material ratio of 1:25, and the pH is adjusted to 4.8 with acetic acid, then 50 FPU / g of cellulose compound enzyme is added, and enzymatic hydrolysis is carried out at 50°C 48h. After enzymolysis, the mixture was centrifuged, washed with hot acid water (pH=2), and freeze-dried. Subsequently, the freeze-dried residue was ball milled again for 5 hours, and then enzymatically hydrolyzed again. The ball mill residue was added to distilled water according to the material ratio of 1:25, and the pH was adjusted to 4.8 with acetic acid, and then 50 FPU / g of cellulose compound enzyme was added. Enzymolysis was carried out at 50°C for 48 hours. After completion, the mixture was centrifuged, washed with hot acid w...

Embodiment 2

[0054] Compared with Example 1, the enzymatic hydrolysis operation in this example is: adjust the pH to 5.0 with acetic acid, then add 40 FPU / g cellulose complex enzyme, and enzymatically hydrolyze for 54 hours at 47°C. , in the catalytic conversion of the enzymatic residue lignin, change the temperature to 260°C and the pressure to 2MPa; the weight ratio of the heteropolyacid salt to the enzymatic residue lignin is 1:20, the step (5) The weight ratio of Raney nickel to the enzymolysis residue lignin is 1:20.

[0055] Structural characterization of lignin degradation products from enzymatic hydrolysis residues:

[0056] Under this condition, the lignin conversion rate was 92.93%, among which the organic phase lignin degradation product yield was 63.9%, the aqueous phase lignin degradation product yield was 18.18%, and the coke yield was 10.85%. Compared with 250°C, at 260°C, the yields of aqueous lignin depolymerization products and organic phase lignin degradation products a...

Embodiment 3

[0058] Compared with Example 1, the enzymatic hydrolysis operation in this example is as follows: adjust the pH to 4.8 with acetic acid, then add 30 FPU / g cellulose compound enzyme, and enzymatically hydrolyze for 72 hours at 45°C. , in the catalytic conversion of the enzymatic residue lignin, change the temperature to 270°C and the pressure to 3MPa; the weight ratio of the heteropolyacid salt to the enzymatic residue lignin is 1:10, the step (5) The weight ratio of Raney nickel to the enzymolysis residue lignin is 1:10.

[0059] Structural characterization of lignin degradation products from enzymatic hydrolysis residues:

[0060] Under this condition, the conversion rate of lignin was 100.69%, the yield of lignin degradation products in organic phase was 77.54%, the yield of lignin degradation products in aqueous phase was 15.16%, and the yield of coke was 7.99%. We found that under this condition, the yield of lignin degradation products in the organic phase increases, whi...

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Abstract

The invention relates to a separation and purification and degradation method for lignin. The method includes the following steps: 1) primary crushing; 2) primary enzymolysis; 3) secondary crushing; 4) secondary enzymolysis; and 5) degradation of an enzymolysis residue lignin. The invention provides a novel extraction method for preparing lignin having high purity and complete structure, wherein the extracted lignin is subjected to high-effective catalytic degradation through a tandem catalyst (e.g. solid heteropolyacid salt-Raney nickel), thus producing an aromatic platform chemical compound. The invention provides a new approach for refining biomass to obtain lignin, and also reduces pollution due to direct emission of the lignin.

Description

technical field [0001] The invention relates to the technical field of extraction and utilization of biomass, in particular to a lignin separation, purification and degradation method. Background technique [0002] In today's society, human beings' demand for energy continues to increase. However, the unrestrained exploitation and utilization of traditional petroleum, coal and other non-renewable fossil fuels are facing increasing shortages, and the consumption of fossil fuels not only causes serious pollution to the environment on which human beings depend, but also Gradually depleting its resources, so it is imperative to find its alternative resources. Biomass mainly refers to materials such as straw, trees and other lignocellulose in the process of agricultural and forestry production, waste from agricultural product processing, agricultural and forestry waste, and poultry manure and waste in the process of animal husbandry. Biomass, as a renewable resource that can be ...

Claims

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Application Information

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IPC IPC(8): C07C49/215C07C45/00C07C43/205C07C41/01B01J25/02B01J31/16B01J27/188
CPCB01J25/02B01J27/188C07C41/01C07C45/00C12P1/00C07C49/215C07C43/205C07C43/2055
Inventor 文甲龙
Owner BEIJING FORESTRY UNIVERSITY
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